WO2004069457A1 - Milling cutter with convexly curved cutting edge - Google Patents

Milling cutter with convexly curved cutting edge Download PDF

Info

Publication number
WO2004069457A1
WO2004069457A1 PCT/SE2004/000126 SE2004000126W WO2004069457A1 WO 2004069457 A1 WO2004069457 A1 WO 2004069457A1 SE 2004000126 W SE2004000126 W SE 2004000126W WO 2004069457 A1 WO2004069457 A1 WO 2004069457A1
Authority
WO
WIPO (PCT)
Prior art keywords
milling cutter
cutting
cutting edges
cutting edge
cutter according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/SE2004/000126
Other languages
French (fr)
Inventor
Karl-Erik BERGLÖW
Mattias Puide
Sven-Erik Persson
Kurt Nordlund
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seco Tools AB
Original Assignee
Seco Tools AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seco Tools AB filed Critical Seco Tools AB
Priority to EP04706405A priority Critical patent/EP1590120B1/en
Priority to AT04706405T priority patent/ATE490832T1/en
Priority to DE602004030422T priority patent/DE602004030422D1/en
Publication of WO2004069457A1 publication Critical patent/WO2004069457A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C5/00—Milling-cutters
    • B23C5/02—Milling-cutters characterised by the shape of the cutter
    • B23C5/10—Shank-type cutters, i.e. with an integral shaft
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/03—Cutting heads comprised of different material than the shank irrespective of whether the head is detachable from the shank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2210/00—Details of milling cutters
    • B23C2210/08—Side or top views of the cutting edge
    • B23C2210/084—Curved cutting edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23C—MILLING
    • B23C2222/00—Materials of tools or workpieces composed of metals, alloys or metal matrices
    • B23C2222/28—Details of hard metal, i.e. cemented carbide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1908—Face or end mill
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1946—Face or end mill
    • Y10T407/1948—Face or end mill with cutting edge entirely across end of tool [e.g., router bit, end mill, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1952—Having peripherally spaced teeth
    • Y10T407/1962—Specified tooth shape or spacing
    • Y10T407/1964—Arcuate cutting edge
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/907—Tool or Tool with support including detailed shank
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/89—Tool or Tool with support
    • Y10T408/909—Having peripherally spaced cutting edges
    • Y10T408/9095—Having peripherally spaced cutting edges with axially extending relief channel
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30952—Milling with cutter holder

Definitions

  • the present invention relates to a milling cutter for rotary cutting machining according to the preamble of the independent claim.
  • shank-type cutters having screwed round cutting inserts in order to, among other things, be used during face milling. Since it most often concerns small dimensions, the hollow cutting inserts become relatively weak, which has manifested itself in tool breakdowns.
  • An object of the present invention is to provide a milling cutter, which solves the above-mentioned problems.
  • Another object of the present invention is to provide a milling cutter, which combines the advantages of round inserts with good strength.
  • Still another object of the present invention is to provide a milling cutter, which cuts softly and relatively vibration-free in the workpiece.
  • Still another object of the present invention is to provide a milling cutter, which enables face milling with high cutting rate.
  • Fig. 1 shows an embodiment of a tool according to the present invention in an assembled state, partly in cross-section, in engagement with a workpiece
  • Figs. 2A and 2B show side views of an embodiment of a milling cutter according to the present invention
  • Fig. 2C shows the milling cutter in an end view
  • Fig. 2D shows the milling cutter in perspective view
  • Fig. 2E shows a part of the milling cutter in cross-section according to the line E-E in Fig. 2C
  • Figs. A and 4B show side views of an alternative embodiment of a milling cutter according to the present invention, in more detail
  • Fig. 4C shows the milling cutter in an end view
  • Fig. 4D shows the milling cutter in a perspective view.
  • the embodiment of a tool shown in Fig. 1 comprises a milling cutter 10 according to the present invention, a locking screw 11 as well as a holder 12.
  • the tool comprises hook-shaped means 15, 19 arranged on milling cutter and locking screw.
  • the milling cutter 10 is at the end thereof turned from the holder 12 provided with a cutting end 13 provided with three cutting edges.
  • a preferred form of the milling cutter 10 is shown more in detail in Figs. 2A-2E.
  • the milling cutter 10 is manufactured from hard material, preferably in cemented carbide and comprises three integrated cutting edges 27A, 27B and 27C.
  • the most common hard material in cemented carbide is wolfram carbide, WC.
  • Many cemented carbide sorts contain only WC and binder metal.
  • carbides of the metals titanium (TiC), tantalum (TaC) and niobium (NbC) are furthermore included.
  • the most common binder metal is cobalt, Co, but also nickel, Ni, is found.
  • the cemented carbide is a powder mixture built up by carbide particles having a grain size of 0,5-10 ⁇ m and a binder metal, generally cobalt.
  • the percentage by volume of the binder metal is 5-40 % and of the carbides 95-60 %.
  • Each cutting edge 27A, 27B and 27C is convexly curved in the axial direction, it is preferably partly circular, and is formed along the intersecting line between a clearance surface 28A, 28B and 28C and a chip surface 29A, 29B and 29C.
  • the cutting edges are positioned at even partition, i.e. each cutting edge forms 120° with the adjacent cutting edge.
  • Each cutting edge is defined in the projection according to Fig.
  • FIG. 2E substantially by a radius R, the radius centre C of which is facing towards the fastening end of the milling cutter and arranged at the side of the centre line or the rotational axis CL in the radial direction.
  • the direction of rotation N is shown in Fig. 2C.
  • the radius centre C is in the plane P for the chip surface 29A, 29B and 29C.
  • Each convex cutting edge 27A, 27B and 27C is continuously curved.
  • the cutting edge has an axially foremost point X, which in the preferred embodiment is arranged at substantially the same radial distance Y from the centre line CL as the radius centre C.
  • each cutting edge 27A, 27B and 27C is convexly curved in the tangential direction, as is seen in the end view according to Fig. 2C so that it comprises a maximum point H at approximately the middle of the cutting edge.
  • Each cutting edge connects to an associated straight edge 30A, 30B, 30C via a corner or end 31 A, 31 B, 31 C having a radius of maximally 1 mm.
  • the edge is not intended to cut.
  • the end 31 A, 31 B, 31 C is arranged at an axial distance Z from a plane P2 that intersects the maximum points X on the cutting edges.
  • the distance Z defines the greatest cutting depth of the milling cutter.
  • the distance Z is 10-15 % of the greatest diameter D of the milling cutter.
  • the radially outermost points 31 A, 31 B, 31 C of the cutting edges are in a common, imaginary circle concentric with the centre line CL of the milling cutter and of the tool, said circle constituting the greatest diameter of the milling cutter.
  • the edges 30A, 30B, 30C are arranged along an imaginary, truncated cone, the tip of which is facing the fastening end, which cone lies radially outside an imaginary extension of the envelope surface of the milling cutter 10. Said cone has a larger cone angle than the cone angle for the envelope surface of the milling cutter 10.
  • the edges may be convex or concave.
  • the cutting edge 27A-27C may alternatively be continuously curved in another way so that it follows an elliptical, parabolic or similar path.
  • the essential point is that the curvature is continuous in order to obtain a fine surface finish of the machined surface on the workpiece.
  • An example of maximum cutting depth is 1 ,9 mm for a diameter D of 16 mm. If the cutting depth at milling is selected larger than the distance Z, milling cutter operator will notice this by the suddenly raised disadvantageous chip formation, which then takes place.
  • Each chip surface 29A, 29B or 29C is substantially planarly formed and has an extension from the cutting edge substantially axially rearwards.
  • Each chip surface forms a positive, acute angle ⁇ , of about 5-20° to the centre line CL of the milling cutter.
  • Each chip surface forms an acute edge angle, of about 60 to 80°, to the clearance surface 28A, 28B and 28C.
  • the clearance surface is arched or curved as well as the associated cutting edge. In the example shown the diameter D is 16 mm while the axial length is 39 mm at the milling cutter.
  • the milling cutter is provided with a first conical portion or shank 14, one end of which is provided with a hook-shaped means 15, which in the embodiment illustrated comprises a first shoulder 16 as well as a first recess 17.
  • the locking screw 11 which preferably is manufactured from steel, has at the end thereof facing towards the milling cutter a second conical portion 18, which is provided with a second engagement means 19, which is intended to co-operate with the first engagement means 15.
  • the second engagement means 19 comprises a second shoulder 20 as well as a second recess 21. In the active position, the first shoulder 16 co-operates with the second recess 21 and the second shoulder 20 with the first recess 17.
  • the locking screw 11 has an externally threaded, preferably cylindrical portion 22.
  • a hex socket wrench handle may be arranged at the axially rear end 22A of the locking screw 11 , whereby loosening or tightening of the locking screw 11 is made possible by the interior duct 24 of the holder 12.
  • the thread 26 may be arranged in an end of a releasable sleeve, the second end of which then is provided with an external thread as well as a key recess.
  • the holder 12 is, at the end thereof facing towards the milling cutter 10 provided with a conical seat 25, which houses the first and second conical portions 14 and 18 of the milling cutter 10 and the locking screw 11 respectively. Inside the conical seat 25, the holder 12 has a substantially cylindrical, internally threaded portion 26, which co-operates with the externally threaded portion 22 on the locking screw 11.
  • the threads 22 and 26 are made as right-hand threads at right-hand cutting tools and as left-hand threads at left-hand cutting tool.
  • the above-described embodiment relates to milling cutters, i.e., tools that rotate around the longitudinal centre line thereof. Milling cutters having small cutting tips are the dominant the field of application for the present invention.
  • Fig. 1 From Fig. 1 is seen that when the milling tool face mills a surface on the workpiece 42, the tool is brought during rotation and great feed in the direction of the arrow I in order to give a planar surface having a good surface finish.
  • Figs. 3A-3D show an alternative embodiment of a shank-type cutter 10' according to the present invention.
  • the cutting end 13 of the shank-type cutter is substantially identical to that has been shown above in connection with the milling cutter 10. Therefore, the same reference numeral is used for the same features.
  • What separates this shank-type cutter from the above shown milling cutter is the design of the fastening means or shank 14'.
  • the shank 14' is cylindrical in order to fit into a conventional spindle in a milling machine, not shown.
  • the corners 31A-31C protrude in relation to a cylindrical first portion 35' having a cylindrical envelope surface, but coincide preferably with a cylindrical extension of the envelope surface of the shank 14'.
  • the diameter D is 16 mm while the axial length of the milling cutter is 66 mm and each corner protrudes 0,3 mm in relation to the envelope surface of the first portion 35'.
  • the milling cutter according to the present invention combines the advantages of round cutting inserts with good strength, which tool cuts softly and relatively vibration-free in the workpiece also at high cutting rate.
  • the milling cutter according to the present invention is preferably at least partly coated with layers of, e.g., AI 2 O 3 ,TiN and/or TiCN. In certain cases, it may be justified with soldered superhard materials such as CBN or PCD on the cutting edges.
  • flush ducts may be arranged in the milling cutter.
  • a flush duct may run centrally through the milling cutter, said flush duct extending from the fastening end and through the milling cutter in the direction of the cutting end.
  • three eccentric ducts connect, one of which is illustrated by a dashed circle in Fig. 3C, for transportation of flushing medium to the respective cutting edge. All ducts then mouth at the same distance from the centre line CL.
  • other shank forms may be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Nonmetal Cutting Devices (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Abstract

The present invention relates to a milling cutter having three cutting edges (27A, 27B, 27C) for rotary cutting machining. The cutting edges are integrated with the milling cutter to a holder. Each cutting edge (27A, 27B, 27C) run from the periphery of the milling cutter and substantially in to the centre line (CL) of the milling cutter. Each of the three cutting edges follows a substantially convex, curved path. The radially outer (31A) and radially inner end of the convex edge (27A, 27B, 27C) is arranged axially behind a maximum point (X) of each of the three cutting edges. Each cutting edge (27A, 27B, 27C) is defined substantially by a radius ®, the radius C of which is facing towards the means (15) and arranged to the side of the centre line (CL) in the radial direction.

Description

MILLING CUTTER WITH CONVEXLY CURVED CUTTING EDGES
Background of the invention
The present invention relates to a milling cutter for rotary cutting machining according to the preamble of the independent claim.
It is previously known by the applicant's US-A-5,964,555 to provide a solution to the problem of making milling tools in small dimensions having replaceable cutting edges. However, it has turned out that at milling of, e.g., moulds in tool steel, that the cutting rate during face milling is not especially large. Furthermore, vibrations arise during use of the known tool.
Furthermore, it is known to provide shank-type cutters having screwed round cutting inserts in order to, among other things, be used during face milling. Since it most often concerns small dimensions, the hollow cutting inserts become relatively weak, which has manifested itself in tool breakdowns.
Objects of the Invention
An object of the present invention is to provide a milling cutter, which solves the above-mentioned problems.
Another object of the present invention is to provide a milling cutter, which combines the advantages of round inserts with good strength.
Still another object of the present invention is to provide a milling cutter, which cuts softly and relatively vibration-free in the workpiece.
Still another object of the present invention is to provide a milling cutter, which enables face milling with high cutting rate.
These and other objects of the present invention are realized by means of a milling cutter of the above-mentioned type, having the features defined in the appended claims.
Brief Description of the Figures
Below, embodiments of the invention will be described, reference being made to the appended drawings, where Fig. 1 shows an embodiment of a tool according to the present invention in an assembled state, partly in cross-section, in engagement with a workpiece; Figs. 2A and 2B show side views of an embodiment of a milling cutter according to the present invention; Fig. 2C shows the milling cutter in an end view; Fig. 2D shows the milling cutter in perspective view; Fig. 2E shows a part of the milling cutter in cross-section according to the line E-E in Fig. 2C; Figs. A and 4B show side views of an alternative embodiment of a milling cutter according to the present invention, in more detail; Fig. 4C shows the milling cutter in an end view; Fig. 4D shows the milling cutter in a perspective view.
Detailed Description of the Invention
The embodiment of a tool shown in Fig. 1 comprises a milling cutter 10 according to the present invention, a locking screw 11 as well as a holder 12. The tool comprises hook-shaped means 15, 19 arranged on milling cutter and locking screw.
The milling cutter 10 is at the end thereof turned from the holder 12 provided with a cutting end 13 provided with three cutting edges. A preferred form of the milling cutter 10 is shown more in detail in Figs. 2A-2E. The milling cutter 10 is manufactured from hard material, preferably in cemented carbide and comprises three integrated cutting edges 27A, 27B and 27C. The most common hard material in cemented carbide is wolfram carbide, WC. Many cemented carbide sorts contain only WC and binder metal. In others, carbides of the metals titanium (TiC), tantalum (TaC) and niobium (NbC) are furthermore included. The most common binder metal is cobalt, Co, but also nickel, Ni, is found. The cemented carbide is a powder mixture built up by carbide particles having a grain size of 0,5-10 μm and a binder metal, generally cobalt. The percentage by volume of the binder metal is 5-40 % and of the carbides 95-60 %. Each cutting edge 27A, 27B and 27C is convexly curved in the axial direction, it is preferably partly circular, and is formed along the intersecting line between a clearance surface 28A, 28B and 28C and a chip surface 29A, 29B and 29C. The cutting edges are positioned at even partition, i.e. each cutting edge forms 120° with the adjacent cutting edge. Each cutting edge is defined in the projection according to Fig. 2E substantially by a radius R, the radius centre C of which is facing towards the fastening end of the milling cutter and arranged at the side of the centre line or the rotational axis CL in the radial direction. The direction of rotation N is shown in Fig. 2C. The radius centre C is in the plane P for the chip surface 29A, 29B and 29C. Each convex cutting edge 27A, 27B and 27C is continuously curved. The cutting edge has an axially foremost point X, which in the preferred embodiment is arranged at substantially the same radial distance Y from the centre line CL as the radius centre C. The outer ends 31 A, 31 B, 31 C as well as the inner ends 33A, 33B, 33C of the cutting edge are arranged axially behind the maximum point X, i.e., in the direction of the holder or against the fastening end of the milling cutter. The radius R is of the same order of size as half of the diameter D of the milling cutter, most often in the interval 1-10 mm. Furthermore, each cutting edge 27A, 27B and 27C is convexly curved in the tangential direction, as is seen in the end view according to Fig. 2C so that it comprises a maximum point H at approximately the middle of the cutting edge.
Each cutting edge connects to an associated straight edge 30A, 30B, 30C via a corner or end 31 A, 31 B, 31 C having a radius of maximally 1 mm. The edge is not intended to cut. The end 31 A, 31 B, 31 C is arranged at an axial distance Z from a plane P2 that intersects the maximum points X on the cutting edges. The distance Z defines the greatest cutting depth of the milling cutter. The distance Z is 10-15 % of the greatest diameter D of the milling cutter. After the end 31 A, 31 B, 31 C in the direction of rotation N, the material approaches the centre line CL in order to obtain clearance. The radially outermost points 31 A, 31 B, 31 C of the cutting edges are in a common, imaginary circle concentric with the centre line CL of the milling cutter and of the tool, said circle constituting the greatest diameter of the milling cutter. The edges 30A, 30B, 30C are arranged along an imaginary, truncated cone, the tip of which is facing the fastening end, which cone lies radially outside an imaginary extension of the envelope surface of the milling cutter 10. Said cone has a larger cone angle than the cone angle for the envelope surface of the milling cutter 10. Alternatively, the edges may be convex or concave.
The cutting edge 27A-27C may alternatively be continuously curved in another way so that it follows an elliptical, parabolic or similar path. The essential point is that the curvature is continuous in order to obtain a fine surface finish of the machined surface on the workpiece. An example of maximum cutting depth is 1 ,9 mm for a diameter D of 16 mm. If the cutting depth at milling is selected larger than the distance Z, milling cutter operator will notice this by the suddenly raised disadvantageous chip formation, which then takes place.
Each chip surface 29A, 29B or 29C is substantially planarly formed and has an extension from the cutting edge substantially axially rearwards. Each chip surface forms a positive, acute angle α, of about 5-20° to the centre line CL of the milling cutter. Each chip surface forms an acute edge angle, of about 60 to 80°, to the clearance surface 28A, 28B and 28C. The clearance surface is arched or curved as well as the associated cutting edge. In the example shown the diameter D is 16 mm while the axial length is 39 mm at the milling cutter.
At the part thereof facing towards the holder 12, the milling cutter is provided with a first conical portion or shank 14, one end of which is provided with a hook-shaped means 15, which in the embodiment illustrated comprises a first shoulder 16 as well as a first recess 17. The locking screw 11 , which preferably is manufactured from steel, has at the end thereof facing towards the milling cutter a second conical portion 18, which is provided with a second engagement means 19, which is intended to co-operate with the first engagement means 15. The second engagement means 19 comprises a second shoulder 20 as well as a second recess 21. In the active position, the first shoulder 16 co-operates with the second recess 21 and the second shoulder 20 with the first recess 17. Axially inside the second engagement means 19, in the axial direction, the locking screw 11 has an externally threaded, preferably cylindrical portion 22. A hex socket wrench handle may be arranged at the axially rear end 22A of the locking screw 11 , whereby loosening or tightening of the locking screw 11 is made possible by the interior duct 24 of the holder 12. Alternatively, the thread 26 may be arranged in an end of a releasable sleeve, the second end of which then is provided with an external thread as well as a key recess.
The holder 12 is, at the end thereof facing towards the milling cutter 10 provided with a conical seat 25, which houses the first and second conical portions 14 and 18 of the milling cutter 10 and the locking screw 11 respectively. Inside the conical seat 25, the holder 12 has a substantially cylindrical, internally threaded portion 26, which co-operates with the externally threaded portion 22 on the locking screw 11.
Assembly and disassembly of the tool is closer disclosed in US-A- 4,850,759, which hereby is incorporated in the description. Co-operation between the external thread 22 and the internal thread 26 entails that the locking screw 11 and thereby also the milling cutter 10 are displaced axially into the holder 12 until the cone-shaped portion 14 comes to abutment against the conical seat 25, i.e., the position according to Fig. 1 has been attained. The milling cutter 10 is now in a satisfactory way anchored in the holder 12.
The threads 22 and 26 are made as right-hand threads at right-hand cutting tools and as left-hand threads at left-hand cutting tool.
The above-described embodiment relates to milling cutters, i.e., tools that rotate around the longitudinal centre line thereof. Milling cutters having small cutting tips are the dominant the field of application for the present invention.
From Fig. 1 is seen that when the milling tool face mills a surface on the workpiece 42, the tool is brought during rotation and great feed in the direction of the arrow I in order to give a planar surface having a good surface finish.
Figs. 3A-3D show an alternative embodiment of a shank-type cutter 10' according to the present invention. The cutting end 13 of the shank-type cutter is substantially identical to that has been shown above in connection with the milling cutter 10. Therefore, the same reference numeral is used for the same features. What separates this shank-type cutter from the above shown milling cutter is the design of the fastening means or shank 14'. The shank 14' is cylindrical in order to fit into a conventional spindle in a milling machine, not shown. Thus, the corners 31A-31C protrude in relation to a cylindrical first portion 35' having a cylindrical envelope surface, but coincide preferably with a cylindrical extension of the envelope surface of the shank 14'. In the example shown, the diameter D is 16 mm while the axial length of the milling cutter is 66 mm and each corner protrudes 0,3 mm in relation to the envelope surface of the first portion 35'.
Thus, the milling cutter according to the present invention combines the advantages of round cutting inserts with good strength, which tool cuts softly and relatively vibration-free in the workpiece also at high cutting rate.
The milling cutter according to the present invention is preferably at least partly coated with layers of, e.g., AI2O3,TiN and/or TiCN. In certain cases, it may be justified with soldered superhard materials such as CBN or PCD on the cutting edges.
The invention is in no way limited to the above-described embodiments but may freely be varied within the scope of the appended claims. For instance, 1-3 flush ducts may be arranged in the milling cutter. For instance, a flush duct may run centrally through the milling cutter, said flush duct extending from the fastening end and through the milling cutter in the direction of the cutting end. There, three eccentric ducts connect, one of which is illustrated by a dashed circle in Fig. 3C, for transportation of flushing medium to the respective cutting edge. All ducts then mouth at the same distance from the centre line CL. Furthermore, other shank forms may be used.

Claims

Claims
1. Milling cutter having three cutting edges (27A,27B,27C) for rotary cutting machining, the cutting edges being integrated with the milling cutter (10; 10'), the milling cutter comprising means (15;14') for fastening the milling cutter to a holder, each cutting edge (27A,27B,27C) running from the periphery of the milling cutter and substantially in to the centre line (CL) of the milling cutter, characterized in that each of the three cutting edges (27A,27B,27C) follows a substantially convex, curved path, the radially outer (31A,31B,31C) and radially inner end (33A,33B,33C) of the convex edge (27A,27B,27C) being arranged axially behind a maximum point (X) of each of the three cutting edges and in that each cutting edge (27A,27B,27C) is defined substantially by a radius (R), the radius centre C of which is facing towards the means (15; 14') and arranged to the side of the centre line (CL) in the radial direction.
2. Milling cutter according to claim 1, characterized in that the radially outer end (31A,31B,31C) of the convex edge (27A,27B,27C) is arranged at an axial distance (Z) from a plane (P2), which intersects the maximum points (X) of the cutting edges.
3. Milling cutter according to any one of the preceding claims, charac- t e r i z e d in that the radius (R) is of the same order of size as half of the greatest diameter (D) of the milling cutter.
4. Milling cutter according to claim 2, characterized in that the distance (Z) is 10-15 % of the greatest diameter (D) of the milling cutter.
5. Milling cutter according to any one of the preceding claims, c h a r a c- t e r i z e d in that the milling cutter is manufactured from cemented carbide and in that each cutting edge (27A-27C) is formed along the intersecting line between a clearance surface (28A-28C) and a chip surface (29A-29C), each clearance surface (28A-28C) being arched or curved as well as associated cutting edge.
6. Milling cutter according to any one of the preceding claims, c h a r a c- t e r i z e d in that the cutting edges (27A-27C) are arranged at even partition on the milling cutter.
7. Milling cutter according to any one of the preceding claims, charac- t e r i z e d in that the milling cutter comprises a conical shank (14) provided with a hook-shaped mean (15).
8. Milling cutter according to any one of claims 1-6, characterized in that the milling cutter comprises a cylindrical shank (14').
9. Milling cutter according to claim 8, characterized in that the ends (31A-31C) substantially coincide with a cylindrical extension of the envelope surface of the shank (14') and protrude in relation to a cylindrical first portion (35') having a cylindrical envelope surface of the shank (14').
10. Milling cutter according to any one of the preceding claims, charac- t e r i z e d in that each cutting edge (27A-27C) is convexly curved in the axial and the tangential direction.
PCT/SE2004/000126 2003-02-06 2004-01-29 Milling cutter with convexly curved cutting edge Ceased WO2004069457A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP04706405A EP1590120B1 (en) 2003-02-06 2004-01-29 Milling cutter with convexly curved cutting edge
AT04706405T ATE490832T1 (en) 2003-02-06 2004-01-29 CUTTER WITH CONVEX CURVED CUTTING EDGE
DE602004030422T DE602004030422D1 (en) 2003-02-06 2004-01-29 CUTTER WITH CONVEX CROOKED CUTTING EDGE

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0300313-4 2003-02-06
SE0300313A SE526105C2 (en) 2003-02-06 2003-02-06 Cutter with three convex curved cutting edges grazing

Publications (1)

Publication Number Publication Date
WO2004069457A1 true WO2004069457A1 (en) 2004-08-19

Family

ID=20290324

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2004/000126 Ceased WO2004069457A1 (en) 2003-02-06 2004-01-29 Milling cutter with convexly curved cutting edge

Country Status (9)

Country Link
US (1) US6976815B2 (en)
EP (1) EP1590120B1 (en)
KR (1) KR101081786B1 (en)
CN (1) CN100591446C (en)
AT (1) ATE490832T1 (en)
CZ (1) CZ299466B6 (en)
DE (1) DE602004030422D1 (en)
SE (1) SE526105C2 (en)
WO (1) WO2004069457A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498203A3 (en) * 2003-07-12 2006-11-02 Fette GmbH End Mill
WO2006118503A1 (en) * 2005-05-02 2006-11-09 Sandvik Intellectual Property Ab Tool and detachable body for tool for chip removing machining
US9296051B2 (en) 2009-12-22 2016-03-29 Nuovo Pignone S.P.A. Mill and method of use

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE527703C2 (en) 2004-08-19 2006-05-16 Sandvik Intellectual Property Rotatable tool and cutting head with axially serrated engaging means
IL174775A (en) * 2006-04-04 2013-06-27 Hanita Metal Works Ltd Face milling cutter
FR2920327B1 (en) * 2007-08-30 2009-11-20 Snecma GRAZING MILL FOR MACHINING WITH HIGH ADVANCE AND LOW PASS DEPTH
US8408850B2 (en) * 2009-06-16 2013-04-02 Kennametal Inc. Twist drill with negative axial rake transition between the lip and the secondary cutting edge
EP2523627B1 (en) * 2010-01-14 2017-07-19 Osstemimplant Co., Ltd. Drill for implant surgery
CN101837486A (en) * 2010-05-31 2010-09-22 哈尔滨汽轮机厂有限责任公司 Head-adjustable hard alloy ball-end milling cutter with TiN composite coating
ITCO20120044A1 (en) * 2012-09-20 2014-03-21 Nuovo Pignone Srl CUTTER AND METHOD OF USE
IN2015DN02461A (en) * 2012-10-10 2015-09-04 Hitachi Tool Eng
JP6307084B2 (en) * 2013-09-19 2018-04-04 ヌオーヴォ ピニォーネ ソチエタ レスポンサビリタ リミタータＮｕｏｖｏ Ｐｉｇｎｏｎｅ Ｓ．Ｒ．Ｌ． Milling tools and methods of use
US20160271706A1 (en) * 2015-03-18 2016-09-22 Kennametal Inc. Endmill with convex ramping edge
US10314610B2 (en) * 2015-03-25 2019-06-11 Medtronic Ps Medical, Inc. Slanted drive axis rotary surgical cutting tools and powered handpieces
US10080579B2 (en) 2015-03-25 2018-09-25 Medtronic Ps Medical, Inc. Pin drive rotary surgical cutting tools and powered handpieces
US9597737B2 (en) 2015-04-27 2017-03-21 Iscar, Ltd. Tool coupling arrangement for drills and reamers
CN108772601A (en) * 2018-05-08 2018-11-09 珠海格力精密模具有限公司 Cell phone appearance processing and forming cutter
KR101941014B1 (en) * 2018-06-14 2019-01-22 황의 Tip for manufacturing mold and method for manufacturing mold using the same
US10849634B2 (en) 2018-06-20 2020-12-01 Medtronic Xomed, Inc. Coupling portion for rotary surgical cutting systems
US11865629B2 (en) 2021-11-04 2024-01-09 Kennametal Inc. Rotary cutting tool with high ramp angle capability
US12582415B2 (en) 2022-11-16 2026-03-24 Medtronic Ps Medical, Inc. Oscillating surgical bone removal tool with fluted cutting head

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09267211A (en) * 1996-03-29 1997-10-14 Hitachi Tool Eng Ltd Ball end mill
JPH10128611A (en) * 1996-10-30 1998-05-19 U F Tool:Kk Ball end mill
JPH1170405A (en) * 1997-08-30 1999-03-16 Hitachi Tool Eng Co Ltd Radius end mill
JPH11216609A (en) * 1998-01-30 1999-08-10 Hitachi Tool Eng Ltd Radius cutter end mill
US5964555A (en) 1996-12-04 1999-10-12 Seco Tools Ab Milling tool and cutter head therefor
JP2001001208A (en) * 1999-06-21 2001-01-09 Hitachi Tool Engineering Ltd End mill for finishing
JP2001071209A (en) * 1999-09-06 2001-03-21 Btt Kk Ball end mill
JP2002292515A (en) 2001-03-29 2002-10-08 Hitachi Tool Engineering Ltd End mill for cutting contour line

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4300862A (en) * 1979-09-05 1981-11-17 Dijet Industrial Co., Ltd. End milling tool
SE457935B (en) * 1987-07-08 1989-02-13 Seco Tools Ab TOOLS FOR CUTTING PROCESSING AND CUTTING BEFORE TOOLS
US4850459A (en) * 1988-04-19 1989-07-25 Allied-Signal Inc. Electrically operated drum brake
US5180022A (en) * 1991-05-23 1993-01-19 Brady William J Rotary mining tools
US5779399A (en) * 1996-03-05 1998-07-14 Mcdonnell Douglas Rotary cutting apparatus
US6158927A (en) * 1996-06-17 2000-12-12 Cole Carbide Industries, Inc. Milling cutter
DE19721900C2 (en) * 1997-05-26 1999-04-15 Fette Wilhelm Gmbh End mill
US6488450B2 (en) * 2001-01-22 2002-12-03 Ingersoll Cutting Tool Company T-slot milling cutter and insert therefor
US6655880B2 (en) * 2001-02-15 2003-12-02 Macarthur Mike End mill
US20040057803A1 (en) * 2002-01-08 2004-03-25 Walrath Richard J. Rotary metal cutting tool
US6846135B2 (en) * 2002-03-25 2005-01-25 Hitachi Tool Engineering Ltd. Radius end mill having radius edge enhanced in resistance to chipping and fracture
JP4189878B2 (en) * 2002-06-21 2008-12-03 トヨタ自動車株式会社 Manufacturing method of bevel gear forging die
DE20310713U1 (en) * 2003-07-12 2003-09-18 Fette GmbH, 21493 Schwarzenbek end mill

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09267211A (en) * 1996-03-29 1997-10-14 Hitachi Tool Eng Ltd Ball end mill
JPH10128611A (en) * 1996-10-30 1998-05-19 U F Tool:Kk Ball end mill
US5964555A (en) 1996-12-04 1999-10-12 Seco Tools Ab Milling tool and cutter head therefor
JPH1170405A (en) * 1997-08-30 1999-03-16 Hitachi Tool Eng Co Ltd Radius end mill
JPH11216609A (en) * 1998-01-30 1999-08-10 Hitachi Tool Eng Ltd Radius cutter end mill
JP2001001208A (en) * 1999-06-21 2001-01-09 Hitachi Tool Engineering Ltd End mill for finishing
JP2001071209A (en) * 1999-09-06 2001-03-21 Btt Kk Ball end mill
JP2002292515A (en) 2001-03-29 2002-10-08 Hitachi Tool Engineering Ltd End mill for cutting contour line

Non-Patent Citations (7)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 199751, Derwent World Patents Index; Class P54, AN 1997-553828, XP002979471 *
DATABASE WPI Week 199830, Derwent World Patents Index; Class P54, AN 1998-341823, XP002979469 *
DATABASE WPI Week 199921, Derwent World Patents Index; Class P54, AN 1999-247771, XP002979470 *
DATABASE WPI Week 199942, Derwent World Patents Index; Class P54, AN 1999-501845, XP002979473 *
DATABASE WPI Week 200117, Derwent World Patents Index; Class P54, AN 2001-162768, XP002979474 *
DATABASE WPI Week 200139, Derwent World Patents Index; Class P54, AN 2001-369804, XP002979472 *
DATABASE WPI Week 200307, Derwent World Patents Index; Class P54, AN 2003-071378, XP002979468 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1498203A3 (en) * 2003-07-12 2006-11-02 Fette GmbH End Mill
WO2006118503A1 (en) * 2005-05-02 2006-11-09 Sandvik Intellectual Property Ab Tool and detachable body for tool for chip removing machining
US7513724B2 (en) 2005-05-02 2009-04-07 Sandvik Intellectual Property Ab Tool and a detachable body for chip removing machining
US9296051B2 (en) 2009-12-22 2016-03-29 Nuovo Pignone S.P.A. Mill and method of use

Also Published As

Publication number Publication date
CN1520953A (en) 2004-08-18
SE0300313D0 (en) 2003-02-06
US6976815B2 (en) 2005-12-20
CZ299466B6 (en) 2008-08-06
EP1590120B1 (en) 2010-12-08
ATE490832T1 (en) 2010-12-15
DE602004030422D1 (en) 2011-01-20
EP1590120A1 (en) 2005-11-02
SE526105C2 (en) 2005-07-05
CZ2004182A3 (en) 2004-09-15
CN100591446C (en) 2010-02-24
KR20040071653A (en) 2004-08-12
SE0300313L (en) 2004-08-07
US20040223817A1 (en) 2004-11-11
KR101081786B1 (en) 2011-11-09

Similar Documents

Publication Publication Date Title
EP1590120B1 (en) Milling cutter with convexly curved cutting edge
US6551035B1 (en) Tool for rotary chip removal, a tool tip and a method for manufacturing a tool tip
EP1152858B1 (en) Tool and cutting head for cutting machining
US6719501B2 (en) Cemented carbide end mill
US5964555A (en) Milling tool and cutter head therefor
KR102349807B1 (en) Interchangeable face-milling head with integrally formed threaded shank-connector
US20030175085A1 (en) Rotary cutting tool
EP3263253B1 (en) Insert, drill, and method of manufacturing cut workpiece employing same
US11717894B2 (en) Indexable drill insert
CN105149658A (en) Adjustable indexable drill and modular system and holder
CN107614174A (en) Knife rest, cutting element and the manufacture method using its machining thing
JP7344321B2 (en) Manufacturing method for rotating tools and cutting products
US10792738B2 (en) Cutting tool and method of manufacturing machined product
JP7727830B2 (en) Drill and cutting process
JP2021100772A (en) Rotary tool and cut product manufacturing method
US11951553B2 (en) Rotatable cutting head having tip portion with three radially extending cutting edges forming a rectilinear rotational profile
JPH1190715A (en) Throw away type drill
CN112077369A (en) Indexable drill insert
JP7700062B2 (en) Method for manufacturing rotary tools and machined products
JP2003094220A (en) Drilling tool
WO2026088668A1 (en) Drill and method for producing cut workpiece
CN108025380A (en) Cutting Tools and Cutting Inserts
JPH11207508A (en) Indexable insert and indexable drill with the indexable insert
JPH10244412A (en) Drilling tool
JP2002355709A (en) Indexable inserts for drills

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NA NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2004706405

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 01411/KOLNP/2005

Country of ref document: IN

Ref document number: 1411/KOLNP/2005

Country of ref document: IN

WWP Wipo information: published in national office

Ref document number: 2004706405

Country of ref document: EP